package com.atguigu.yygh.cmn.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.yygh.cmn.listener.DictListener;
import com.atguigu.yygh.cmn.mapper.DictMapper;
import com.atguigu.yygh.cmn.service.DictService;
import com.atguigu.yygh.model.cmn.Dict;
import com.atguigu.yygh.vo.cmn.DictEeVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService {

    //根据数据id查询子数据列表
    @Override
    @Cacheable(value = "dict",keyGenerator = "keyGenerator" )
    public List<Dict> findChildData(Long id) {
        QueryWrapper<Dict> queryWrapper=new QueryWrapper<>();
        queryWrapper.eq("parent_id",id);
        List<Dict> dictList = baseMapper.selectList(queryWrapper);
        for (Dict dict : dictList) {
            Long dictId = dict.getId();
            boolean isChild = isChildren(dictId);
            dict.setHasChildren(isChild);
        }
        return dictList;
    }

    //导出数据字典接口
    @Override
    @CacheEvict(value = "dict", allEntries=true)
    public void exportDictData(HttpServletResponse response) {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String fileName = "dict";
        response.setHeader("Content-disposition", "attachment;filename="+ fileName + ".xlsx");

        //查询数据库
        List<Dict> dictList = baseMapper.selectList(null);
        //把dict转换为 dictEeVo
        List<DictEeVo> dictEeVos=new ArrayList<>();
        for(Dict dict:dictList){
            DictEeVo dictEeVo=new DictEeVo();
            BeanUtils.copyProperties(dict,dictEeVo);
            dictEeVos.add(dictEeVo);
        }

        //调用方法进行写操作
        try {
            EasyExcel.write(response.getOutputStream(),DictEeVo.class).sheet("dict")
                    .doWrite(dictEeVos);
        } catch (IOException e) {
            e.printStackTrace();
        }


    }

    @Override
    public void importDictData(MultipartFile file) {
        try {
            EasyExcel.read(file.getInputStream(),DictEeVo.class,new DictListener(baseMapper)).sheet().doRead();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //根据dictcode和value查询
    @Override
    public String getDictName(String dictCode, String value) {
        //如果dictCode本身为空，直接根据value查询
        if (StringUtils.isEmpty(dictCode)){
            //直接根据value查询
            QueryWrapper<Dict> wrapper = new QueryWrapper<>();
            wrapper.eq("value",value);
            Dict dict = baseMapper.selectOne(wrapper);
            return dict.getName();
        }else {
            //根据dictCode查询dict对象，得到dict的id值
            Dict codeDict = getDictByDictCode(dictCode);
            Long parent_id = codeDict.getId();
            //根据parent_id和value值进行查询
            Dict finalDict = baseMapper.selectOne(new QueryWrapper<Dict>().eq("parent_id", parent_id)
                    .eq("value", value));
            return finalDict.getName();
        }
    }

    //根据dictCode获取下级节点
    @Override
    public List<Dict> findByDictCode(String dictCode) {
        //根据dictCode获取对应的id
        Dict dict = this.getDictByDictCode(dictCode);
        //根据id获取下层子节点
        List<Dict> list = this.findChildData(dict.getId());
        return list;
    }

    private Dict getDictByDictCode(String dictCode){
        QueryWrapper<Dict> wrapper = new QueryWrapper<>();
        wrapper.eq("dict_Code",dictCode);
        return baseMapper.selectOne(wrapper);
    }



    //判断id下面是否有子节点
    private boolean isChildren(Long id){
        QueryWrapper<Dict> queryWrapper=new QueryWrapper<>();
        queryWrapper.eq("parent_id",id);
        Integer count = baseMapper.selectCount(queryWrapper);
        return count>0;
    }
}
